Yersinia enterocolitica Flashcards
1
Q
what is the biology of Yersinia?
A
- Gram Negative Bacilli
- “Bi-Polar Staining
- Non-lactose fermenter
- Motile at 25° but not at 37°
- Coagulase (+)
- Cold Growth
2
Q
what does yersinia ferment?
A
sucrose
3
Q
how does yersinia spread?
A
- fecal-oral if contact with animals (zoonotic)
- Associated with unpasteurized milk, soft cheeses and undercooked pork products
4
Q
when is there higher incidence of yersinia infeciton?
A
Higher incidence in cold climates and months
5
Q
how does the infection of yersinia progress?
A
- Access to lamina propria is primarily through M cells
- T3SS effectors mediate resistance to mac killing and can trigger apoptosis
- Travel via macrophages to MLN and replicate intracellular.
6
Q
most yersenia infections occur on who?
A
children
7
Q
what does yersinia infection cause?
A
gastroenteritis
8
Q
yersinia infection has what symptoms?
A
- Severe abdominal cramping
- Low-grade fever
- Vomiting
- Large volume watery diarrhea,
9
Q
what complications can arise with yersinia enterocolitica?
A
- Reactive arthritis (HLA-B27)
- Pseudo-appendicitis*/mesenteric adenitis (older children&teens)
- Erythema nodosum** (adults)
10
Q
what treatment is given to yersinia enterocolitica infection?
A
Supportive
11
Q
how does yersinia look on Hektoen agar?
A
Yellow colony
12
Q
how does yersinia look on MacConkey agar?
A
whitish-transluscent
